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Chris Stormer
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Non-Defined Subdomains

How can I force my website to not function when there is a subdomain that is not in the dns.

ex//

test.domain.com <- invalice
mail.domain.com <-valid

how can I force test.domain to go to domain.com is this a dns issue or a server setting?
Apache Web ServerDNS

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Last Comment
jeremycrussell

8/22/2022 - Mon
farzanj

Try iptables

If the entry is not in the DNS, it should not get a reply.

Block Invalid
iptables -A -p tcp -d test.domain.com --dport 80 -j DROP

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Forwarding to another domain
iptables -t nat -A PREROUTING -d test.domain -p tcp --dport 80 -j DNAT --to domain.com

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Chris Stormer

ASKER
A follow up question is which is better from an SEO point of view?

Is it better to make all the sites with broken links that point to my domain still function if someone clicks on the link or Google comes in off that link... by having them redirect to the domain.com version.

Basically..

badtext.domain.com/page/page.php = .domain.com/page/page.php

Is that more of a URL rewrite... issue or should i just make anything that does not point to the right domain not work..
ASKER CERTIFIED SOLUTION
jeremycrussell

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